299 lines
8.1 KiB
C
299 lines
8.1 KiB
C
/*
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* RTP network protocol
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* Copyright (c) 2002 Fabrice Bellard.
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include <unistd.h>
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#include <stdarg.h>
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#include "network.h"
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#include <fcntl.h>
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#define RTP_TX_BUF_SIZE (64 * 1024)
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#define RTP_RX_BUF_SIZE (128 * 1024)
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typedef struct RTPContext {
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URLContext *rtp_hd, *rtcp_hd;
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int rtp_fd, rtcp_fd;
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} RTPContext;
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/**
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* If no filename is given to av_open_input_file because you want to
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* get the local port first, then you must call this function to set
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* the remote server address.
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*
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* @param s1 media file context
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* @param uri of the remote server
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* @return zero if no error.
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*/
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int rtp_set_remote_url(URLContext *h, const char *uri)
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{
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RTPContext *s = h->priv_data;
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char hostname[256];
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int port;
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char buf[1024];
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char path[1024];
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
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path, sizeof(path), uri);
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snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
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udp_set_remote_url(s->rtp_hd, buf);
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snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, path);
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udp_set_remote_url(s->rtcp_hd, buf);
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return 0;
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}
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/* add option to url of the form:
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"http://host:port/path?option1=val1&option2=val2... */
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static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
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{
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char buf1[1024];
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va_list ap;
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va_start(ap, fmt);
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if (strchr(buf, '?'))
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pstrcat(buf, buf_size, "&");
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else
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pstrcat(buf, buf_size, "?");
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vsnprintf(buf1, sizeof(buf1), fmt, ap);
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pstrcat(buf, buf_size, buf1);
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va_end(ap);
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}
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static void build_udp_url(char *buf, int buf_size,
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const char *hostname, int port,
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int local_port, int multicast, int ttl)
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{
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snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
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if (local_port >= 0)
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url_add_option(buf, buf_size, "localport=%d", local_port);
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if (multicast)
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url_add_option(buf, buf_size, "multicast=1");
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if (ttl >= 0)
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url_add_option(buf, buf_size, "ttl=%d", ttl);
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}
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/*
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* url syntax: rtp://host:port[?option=val...]
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* option: 'multicast=1' : enable multicast
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* 'ttl=n' : set the ttl value (for multicast only)
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* 'localport=n' : set the local port to n
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*
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*/
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static int rtp_open(URLContext *h, const char *uri, int flags)
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{
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RTPContext *s;
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int port, is_output, is_multicast, ttl, local_port;
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char hostname[256];
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char buf[1024];
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char path[1024];
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const char *p;
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is_output = (flags & URL_WRONLY);
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s = av_mallocz(sizeof(RTPContext));
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if (!s)
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return AVERROR(ENOMEM);
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h->priv_data = s;
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url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
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path, sizeof(path), uri);
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/* extract parameters */
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is_multicast = 0;
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ttl = -1;
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local_port = -1;
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p = strchr(uri, '?');
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if (p) {
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is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
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if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
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ttl = strtol(buf, NULL, 10);
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}
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if (find_info_tag(buf, sizeof(buf), "localport", p)) {
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local_port = strtol(buf, NULL, 10);
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}
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}
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build_udp_url(buf, sizeof(buf),
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hostname, port, local_port, is_multicast, ttl);
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if (url_open(&s->rtp_hd, buf, flags) < 0)
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goto fail;
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local_port = udp_get_local_port(s->rtp_hd);
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/* XXX: need to open another connection if the port is not even */
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/* well, should suppress localport in path */
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build_udp_url(buf, sizeof(buf),
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hostname, port + 1, local_port + 1, is_multicast, ttl);
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if (url_open(&s->rtcp_hd, buf, flags) < 0)
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goto fail;
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/* just to ease handle access. XXX: need to suppress direct handle
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access */
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s->rtp_fd = udp_get_file_handle(s->rtp_hd);
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s->rtcp_fd = udp_get_file_handle(s->rtcp_hd);
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h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
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h->is_streamed = 1;
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return 0;
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fail:
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if (s->rtp_hd)
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url_close(s->rtp_hd);
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if (s->rtcp_hd)
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url_close(s->rtcp_hd);
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av_free(s);
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return AVERROR_IO;
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}
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static int rtp_read(URLContext *h, uint8_t *buf, int size)
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{
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RTPContext *s = h->priv_data;
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struct sockaddr_in from;
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socklen_t from_len;
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int len, fd_max, n;
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fd_set rfds;
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#if 0
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for(;;) {
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from_len = sizeof(from);
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len = recvfrom (s->rtp_fd, buf, size, 0,
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(struct sockaddr *)&from, &from_len);
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if (len < 0) {
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if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
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ff_neterrno() == FF_NETERROR(EINTR))
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continue;
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return AVERROR_IO;
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}
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break;
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}
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#else
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for(;;) {
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/* build fdset to listen to RTP and RTCP packets */
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FD_ZERO(&rfds);
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fd_max = s->rtp_fd;
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FD_SET(s->rtp_fd, &rfds);
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if (s->rtcp_fd > fd_max)
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fd_max = s->rtcp_fd;
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FD_SET(s->rtcp_fd, &rfds);
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n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
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if (n > 0) {
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/* first try RTCP */
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if (FD_ISSET(s->rtcp_fd, &rfds)) {
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from_len = sizeof(from);
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len = recvfrom (s->rtcp_fd, buf, size, 0,
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(struct sockaddr *)&from, &from_len);
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if (len < 0) {
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if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
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ff_neterrno() == FF_NETERROR(EINTR))
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continue;
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return AVERROR_IO;
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}
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break;
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}
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/* then RTP */
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if (FD_ISSET(s->rtp_fd, &rfds)) {
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from_len = sizeof(from);
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len = recvfrom (s->rtp_fd, buf, size, 0,
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(struct sockaddr *)&from, &from_len);
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if (len < 0) {
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if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
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ff_neterrno() == FF_NETERROR(EINTR))
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continue;
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return AVERROR_IO;
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}
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break;
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}
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}
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}
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#endif
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return len;
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}
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static int rtp_write(URLContext *h, uint8_t *buf, int size)
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{
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RTPContext *s = h->priv_data;
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int ret;
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URLContext *hd;
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if (buf[1] >= 200 && buf[1] <= 204) {
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/* RTCP payload type */
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hd = s->rtcp_hd;
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} else {
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/* RTP payload type */
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hd = s->rtp_hd;
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}
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ret = url_write(hd, buf, size);
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#if 0
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{
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = 10 * 1000000;
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nanosleep(&ts, NULL);
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}
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#endif
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return ret;
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}
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static int rtp_close(URLContext *h)
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{
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RTPContext *s = h->priv_data;
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url_close(s->rtp_hd);
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url_close(s->rtcp_hd);
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av_free(s);
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return 0;
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}
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/**
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* Return the local port used by the RTP connection
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* @param s1 media file context
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* @return the local port number
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*/
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int rtp_get_local_port(URLContext *h)
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{
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RTPContext *s = h->priv_data;
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return udp_get_local_port(s->rtp_hd);
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}
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/**
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* Return the rtp and rtcp file handles for select() usage to wait for several RTP
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* streams at the same time.
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* @param h media file context
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*/
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void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
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{
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RTPContext *s = h->priv_data;
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*prtp_fd = s->rtp_fd;
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*prtcp_fd = s->rtcp_fd;
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}
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URLProtocol rtp_protocol = {
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"rtp",
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rtp_open,
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rtp_read,
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rtp_write,
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NULL, /* seek */
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rtp_close,
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};
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